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Mu waves, also known as mu rhythms, comb or wicket rhythms, arciform rhythms, or sensorimotor rhythms, are synchronized patterns of electrical activity involving large numbers of neurons, probably of the pyramidal type, in the part of the brain that controls voluntary movement. person suppresses mu wave patterns when he or she performs a motor action or, with practice, when he or she visualizes performing a motor action. This suppression is called desynchronization of the wave because EEG wave forms are caused by large numbers of neurons firing in synchrony.
Waves are generally divided up into two types of wave - longitudinal and transverse. Longitudinal waves are waves where the displacement of the particles is parallel to the direction of travel of the wave (the vibrations are along the direction of the travel of the wave). The example of this is sound waves, where there are compressions and rarefactions in the air that cause the sound to be transmitted.